Brian Cashman alerted the media that he needed to make an announcement, and as reporters gathered around him in the Yankees dugout this morning, Cashman’s tone was about as somber as I’ve ever heard. He didn’t have many answers — couldn’t provide specific details of the injury, had no idea what it meant for the future — but it was clear that Cashman was overwhelmingly concerned about Joba Chamberlain.

“I just know those (questions about the future) are running through him,” Cashman said. “I feel bad because I know how much he loves this game. I know how much he was looking forward to coming back ahead of schedule. He’d pushed the schedule ahead and this was just an unfortunate accident that’s clearly derailed that. What more does that mean? I don’t know. He’s a good man. He’s a good father. It’s just an unfortunate circumstance that’s occurred.”

Cashman got a call just before last night’s national anthem telling him that Chamberlain had been playing with his son at a Tampa-area activities center for kids. There were trampolines — or something like trampolines — involved, and Chamberlain suffered an open dislocation of his right ankle. The only positive was that Chamberlain’s son was apparently uninjured. Chamberlain himself was taken to St. Joseph’s hospital by a team of paramedics, and he had surgery last night.

What all of that means is still very much up in the air, but Cashman kept calling it a “significant injury” and a “significant situation.”

“From a team standpoint it’s a massive loss because he’s really good,” Cashman said. “But right now the most important thing is not what it means to the team, it’s really what it means to him personally for the present and the future.”

How much longer will he be in the hospital? “It’s going to be at least a number of days,” Cashman said.

Could this be career threatening? “I just couldn’t say,” Cashman said. “I’d like to say no. My heart and my gut tells me no, that that’s not the case.”

Did jumping on a trampoline violate Chamberlain’s contract? “I haven’t even looked at it,” Cashman said.

• The positive news from this morning is that Andy Pettitte threw batting practice with no problems. “Missed a few spots,” he said. “But otherwise, everything’s where it needs to be.”

• Pettitte said that both Larry Rothschild and Mike Harkey gave him positive feedback, saying his arm slot was consistent and the movement was late on his two-seamer and changeup. Petttitte also said his four-seamer was “riding nice.” He felt good enough that he thought he could have thrown 10 or 15 more pitches.

• Something you might not think about with a guy like Pettitte: He said he’s having trouble reading the ball off the bat. It’s been so long since he’s been in a game, he’s not seeing the ball very well upon contact, and he’s had trouble with that even in PFP. He told the Yankees he wanted an L-screen in front of himself for today’s BP for that very reason. He expects that to get better.

• Dave Robertson also threw pain-free batting practice this morning and thinks he could be in Tuesday’s game. He’s happy with the way he feels, just feels like he wasn’t locating today. “I feel like I can throw the ball better than that,” he said. “I just haven’t done it yet.”

• Jorge Vazquez is scheduled to play today, but first he’s scheduled to see a doctor about his hand, which was hit by a pitch last night. He said it feels OK, but he needs to get it checked out. It was heavily wrapped this morning.

• Manny Delcarmen also threw batting practice today. Michael Pineda and Phil Hughes each threw sides. CC Sabathia is throwing a side tomorrow, which keeps him on his regular schedule.